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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14407) DistCp - Introduce a configurable copy buffer size
Date Wed, 17 May 2017 10:37:05 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16013830#comment-16013830

Steve Loughran commented on HADOOP-14407:

(I wouldn't worry about trailing whitespace...that's something whoever commits it needs to

git alias for a "git apx" command to do the merge
alias.apx=apply -3 --verbose --whitespace=fix

> DistCp - Introduce a configurable copy buffer size
> --------------------------------------------------
>                 Key: HADOOP-14407
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14407
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: tools/distcp
>    Affects Versions: 2.9.0
>            Reporter: Omkar Aradhya K S
>            Assignee: Omkar Aradhya K S
>             Fix For: 2.9.0, 3.0.0-alpha3
>         Attachments: HADOOP-14407.001.patch, HADOOP-14407.002.patch
> Currently, the RetriableFileCopyCommand has a fixed copy buffer size of just 8KB. We
have noticed in our performance tests that with bigger buffer sizes we saw upto ~3x performance
boost. Hence, making the copy buffer size a configurable setting via the new parameter <copybuffersize>.

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